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Thanks a lot Angie and others. I should have had the wit to search SAP but I was getting so steamed up with other acronyms that were company-internal that I went into a blue funk. 4 KudoZ points were awarded for this answer
"An rKL is a Java and XML based mechanism that allows for the real-time analysis of user click-stream data, as well as incorporating existing 3rd party personalization/modeling tools already in use by the site operator and historical user group behaviors and activities."
Explanation: According to this SAP site, RKL is Leistungsverrechnung Ist in German and Actual Activity Allocation in English.
RKL Actual Activity Allocation
Each component in the CO application component uses specific business transactions. When you activate a CO component (this can take place gradually), you must make sure that all business transactions used by the component have been assigned to number ranges. Otherwise you will not be able to call up the business transactions in the System.